وَمِنْ مُسْنَدِ عَلِيِّ بْنِ أَبِي طَالِبٍ رَضِيَ اللَّهُ عَنْهُ
5  
Musnad 'Ali Ibn Abi Talib
Musnad Ahmad 1219
It was narrated that Abu `Abdur-Rahman said:
I heard ‘Ali (رضي الله عنه) say: The Messenger of Allah (ﷺ) said: “When a person sits in the place where he prayed after praying the angels send blessings upon him, and their blessings upon him are: O Allah, forgive him. O Allah have mercy on him. And if he sits waiting for the prayer, the angels send blessings upon him, and their blessings upon him are: O Allah, forgive him, O Allah have mercy on him.
حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ عَطَاءِ بْنِ السَّائِبِ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ، قَالَ سَمِعْتُ عَلِيًّا، رَضِيَ اللَّهُ عَنْهُ يَقُولُ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّ الْعَبْدَ إِذَا جَلَسَ فِي مُصَلَّاهُ بَعْدَ الصَّلَاةِ صَلَّتْ عَلَيْهِ الْمَلَائِكَةُ وَصَلَاتُهُمْ عَلَيْهِ اللَّهُمَّ اغْفِرْ لَهُ اللَّهُمَّ ارْحَمْهُ وَإِنْ جَلَسَ يَنْتَظِرُ الصَّلَاةَ صَلَّتْ عَلَيْهِ الْمَلَائِكَةُ وَصَلَاتُهُمْ عَلَيْهِ اللَّهُمَّ اغْفِرْ لَهُ اللَّهُمَّ ارْحَمْهُ‏.‏
Grade: Hasan because of corroborating evidence] (Darussalam)
Reference : Musnad Ahmad 1219
In-book reference : Book 5, Hadith 627